Add tsconfig.json configuration file

This newly added tsconfig.json file extends configurations from two existing templates and allows JavaScript files. It includes all files in the 'test' directory and 'src' directory, as well as the 'index.d.ts' file. This ensures a consistent TypeScript setup for the project.

tsconfig.json

@@ -0,0 +1,13 @@
+{
+  "extends": ["@tsconfig/node22/tsconfig.json", "@tsconfig/strictest/tsconfig.json"],
+  "compilerOptions": {
+    "allowJs": true
+  },
+  "include": [
+    "test/**/*",
+    "src"
+  ],
+  "files": [
+    "index.d.ts"
+  ]
+}